Updates column definition

<div class="definition">
    updateColumn(fields, changes)
</div>

<div class="arguments">
    <table>
    <tr>
        <td>fields</td>
        <td><b>array of string</b>, field names of columns to update</td>
    </tr>
    <tr>
        <td>changes</td>
        <td><b>object</b>, object with changes</td>
    </tr>
    </table>
</div>
Returns <i>number</i> of effected columns.

<h4>Description</h4>

This method will update corresponding columns and refresh the grid.
<div style="height: 10px"></div>

If you have following grid:
<textarea class="javascript">
let grid = new w2grid({
    name    : 'grid',
    columns: [
        { field: 'recid', text: 'ID', size: '50px' },
        { field: 'lname', text: 'Last Name', size: '30%' },
        { field: 'fname', text: 'First Name', size: '30%' },
        { field: 'email', text: 'Email', size: '40%' },
        { field: 'sdate', text: 'End Date', size: '120px' }
    ],
    records: [
        { recid: 1, fname: 'John', lname: 'doe', email: 'vitali@gmail.com', sdate: '1/3/2012' },
        { recid: 2, fname: 'Stuart', lname: 'Motzart', email: 'jdoe@gmail.com', sdate: '2/4/2012' },
        { recid: 3, fname: 'Jin', lname: 'Franson', email: '--', sdate: '4/23/2012' },
        { recid: 4, fname: 'Susan', lname: 'Ottie', email: 'jdoe@gmail.com', sdate: '5/3/2012' },
        { recid: 5, fname: 'Kelly', lname: 'Silver', email: 'jdoe@gmail.com', sdate: '4/3/2012' },
        { recid: 6, fname: 'Francis', lname: 'Gatos', email: 'vitali@gmail.com', sdate: '2/5/2012' }
    ]
});
</textarea>

And if the grid is locked, you can unlock it by
<textarea class="javascript">
w2ui.grid.updateColumn(['fname', 'lname'], { hidden: true });
</textarea>